Using inotifywait -mr on the target:
~~~
root@nuc2:~# inotifywait -mr /var/lib/lxd/shmounts
Setting up watches. Beware: since -r was given, this may take a while!
Watches established.
/var/lib/lxd/shmounts/ CREATE,ISDIR sample2
/var/lib/lxd/shmounts/ OPEN,ISDIR sample2
/var/lib/lxd/shmounts/ ACCESS,ISDIR sample2
/var/lib/lxd/shmounts/ CLOSE_NOWRITE,CLOSE,ISDIR sample2
/var/lib/lxd/shmounts/sample2/ DELETE_SELF
/var/lib/lxd/shmounts/ DELETE,ISDIR sample2
~~~
Next a little more low-tech: an infinite loop trying to read the
directory contents.
-----
#include <dirent.h>
#include <stdio.h>
#include <errno.h>
int main(int argc, char *argv[])
{
while(1) {
DIR *dirp=opendir(argv[1]);
struct dirent *de;
if (!dirp) {
if (errno != ENOENT) {
perror("opendir");
return 1;
}
continue;
}
de = readdir(dirp);
while(de) {
printf("%s\n", de->d_name);
de = readdir(dirp);
}
closedir(dirp);
printf("---\n");
fflush(stdout);
}
}
-----
Left this running on the target with argument
"/var/lib/lxd/shmounts/sample2", then ran the migration. It showed that
as long as that directory exists, it is empty (obviously this is a race,
but it's a pretty quick loop).
So this confirms your theory that /dev does not exist - but doesn't help
explain why not :-(
I then tried running the migration with both strace *and* the above loop
running. I got a variation on the error that I have not seen before:
~~~
root@nuc1:~# lxc move sample nuc2:sample2
error: Error transferring container data: restore failed:
(00.130707) 1: Error (namespaces.c:1153): uns: send req error: Invalid
argument
(00.130828) 1: Error (cgroup.c:1065): cg: couldn't set cgns prefix
blkio//lxc/sample2/tasks: Invalid argument
(00.130889) 1: Error (cgroup.c:1089): cg: failed preparing cgns(00.131423)
PID: real 24376 virt 1
(00.132255) Error (cr-restore.c:2012): Can't attach to init: Operation not
permitted
(00.191169) Error (cr-restore.c:2182): Restoring FAILED.
~~~
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https://bugs.launchpad.net/bugs/1580765
Title:
Live migration error: Can't mount at ./dev/.lxd-mounts
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https://bugs.launchpad.net/ubuntu/+source/criu/+bug/1580765/+subscriptions
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